Hi StefanB. Please do not spread false instructions about Republic of Serbia. Additionally, foreign names are added to the places, as per the OSM rules, and in accordance to editors' competency and good will. Any attempt to vandalise the map of Serbia will firmly be moderated by OSM Serbian community. If you wish to act constructively for change, there are plenty of places in Slovenia lacking Italian and Hungarian labels, and that is a great chance to improve the accuracy of OSM.